SLO¶
Guance SLO monitoring revolves around various metrics to test whether the availability of system services meets target requirements.
Concepts¶
| Term | Description |
|---|---|
| SLA | Service-Level Agreement, which refers to the service commitment made by the system service provider (Provider) to the customer (Customer). You can rate the SLA of the service provider's service quality and monitor the compliance rate in real time. |
| SLI | Service Level Indicator, which refers to the metric selected to measure system stability. Guance SLI supports setting one or more measurement metrics based on monitors. |
| SLO | Service Level Objective, the smallest unit for SLA rating processing in Guance. It is the target for the cumulative number of successes of SLI within a time window. SLO is often converted into an error budget to calculate the tolerable number of errors. In each detection cycle, the time during which an abnormal event occurs will be deducted from the tolerable error duration. |
As shown in the figure above, the system detects anomalies every 5 minutes. The coverage time of each abnormal event is precisely calculated based on its actual start and end points (the start time is based on the detection time window, and the end time is composed of the start time of the event plus its duration). The deduction amount is the total coverage time after merging all abnormal events (overlapping periods are counted only once).